IOTA/IOTA-ES occultation update for (1605) Milankovitch / HIP 60081 event on 2008 Dec 07, 00:05 UT Visible from India, SW Asia Summary ------- On 2008 Dec 07 UT, the 33 km diameter asteroid (1605) Milankovitch will occult a 8.0 mag star in the constellation Virgo for observers along a path across India, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.9 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 63 * date and approx. time of event: 2008 Dec 07, 00:02 - 2008 Dec 07, 00:04 UT * midpoint of event [JD]: 2454807.50415417 * magnitude of target star: 8.0 * magnitude drop [mag]: 7.9 * estimated maximum duration [s]: 1.2 * Moon: 62 % sunlit, 172° distance * Sun: 69° distance * rough path description: India, SW Asia The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 0.97 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .015) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .014", 99° ) * approx speed of asteroid's shadow [km/s]: 26.5220 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 60081 by 1605 Milankovitch on 2008 Dec 7 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 21 0 0 39 13 23 0 2 16 0 94 -64 39 3 45 39 23 1 38 45 6 39 41 45 22 0 0 39 9 41 0 2 16 1 95 -63 39 0 3 39 19 20 38 41 24 39 38 4 23 0 0 39 5 44 0 2 16 2 96 -63 38 56 5 39 15 23 38 37 25 39 34 8 24 0 0 39 1 30 0 2 16 2 96 -62 38 51 52 39 11 9 38 33 11 39 29 55 25 0 0 38 57 1 0 2 16 3 97 -61 38 47 22 39 6 40 38 28 41 39 25 26 26 0 0 38 52 16 0 2 16 4 98 -61 38 42 36 39 1 55 38 23 55 39 20 42 27 0 0 38 47 14 0 2 17 5 98 -60 38 37 35 38 56 54 38 18 52 39 15 42 28 0 0 38 41 57 0 2 17 6 99 -59 38 32 17 38 51 37 38 13 34 39 10 25 29 0 0 38 36 24 0 2 17 6 99 -59 38 26 43 38 46 4 38 8 0 39 4 53 30 0 0 38 30 34 0 2 18 7 100 -58 38 20 54 38 40 15 38 2 9 38 59 5 31 0 0 38 24 29 0 2 18 8 101 -57 38 14 48 38 34 11 37 56 3 38 53 1 32 0 0 38 18 8 0 2 19 9 101 -56 38 8 26 38 27 50 37 49 40 38 46 41 33 0 0 38 11 31 0 2 19 9 102 -56 38 1 49 38 21 13 37 43 2 38 40 5 34 0 0 38 4 38 0 2 20 10 103 -55 37 54 55 38 14 20 37 36 8 38 33 13 35 0 0 37 57 29 0 2 20 11 103 -54 37 47 46 38 7 12 37 28 57 38 26 6 36 0 0 37 50 4 0 2 21 12 104 -54 37 40 21 37 59 48 37 21 31 38 18 42 37 0 0 37 42 23 0 2 22 13 104 -53 37 32 39 37 52 7 37 13 49 38 11 3 38 0 0 37 34 26 0 2 23 13 105 -52 37 24 42 37 44 11 37 5 51 38 3 7 39 0 0 37 26 14 0 2 24 14 106 -51 37 16 29 37 35 59 36 57 37 37 54 56 40 0 0 37 17 45 0 2 25 15 106 -51 37 8 0 37 27 31 36 49 7 37 46 30 41 0 0 37 9 1 0 2 26 16 107 -50 36 59 16 37 18 48 36 40 21 37 37 47 42 0 0 37 0 1 0 2 27 17 108 -49 36 50 15 37 9 48 36 31 20 37 28 49 43 0 0 36 50 46 0 2 28 18 108 -48 36 40 59 37 0 33 36 22 3 37 19 35 44 0 0 36 41 14 0 2 29 18 109 -47 36 31 27 36 51 2 36 12 30 37 10 5 45 0 0 36 31 28 0 2 30 19 109 -47 36 21 40 36 41 16 36 2 41 37 0 20 46 0 0 36 21 25 0 2 31 20 110 -46 36 11 37 36 31 14 35 52 37 36 50 19 47 0 0 36 11 7 0 2 33 21 111 -45 36 1 18 36 20 57 35 42 17 36 40 3 48 0 0 36 0 33 0 2 34 22 111 -44 35 50 44 36 10 24 35 31 42 36 29 31 49 0 0 35 49 44 0 2 35 22 112 -43 35 39 54 35 59 35 35 20 51 36 18 44 50 0 0 35 38 40 0 2 37 23 113 -43 35 28 49 35 48 32 35 9 45 36 7 41 51 0 0 35 27 20 0 2 38 24 113 -42 35 17 29 35 37 13 34 58 24 35 56 23 52 0 0 35 15 46 0 2 40 25 114 -41 35 5 54 35 25 38 34 46 47 35 44 50 53 0 0 35 3 56 0 2 42 26 115 -40 34 54 3 35 13 49 34 34 55 35 33 2 54 0 0 34 51 51 0 2 43 27 115 -39 34 41 57 35 1 45 34 22 48 35 20 59 55 0 0 34 39 31 0 2 45 27 116 -38 34 29 37 34 49 25 34 10 27 35 8 41 56 0 0 34 26 56 0 2 47 28 117 -38 34 17 1 34 36 51 33 57 50 34 56 8 57 0 0 34 14 6 0 2 49 29 117 -37 34 4 11 34 24 2 33 44 59 34 43 20 58 0 0 34 1 2 0 2 51 30 118 -36 33 51 6 34 10 59 33 31 53 34 30 18 59 0 0 33 47 44 0 2 53 31 119 -35 33 37 47 33 57 41 33 18 32 34 17 1 60 0 0 33 34 11 0 2 55 32 119 -34 33 24 14 33 44 8 33 4 57 34 3 30 61 0 0 33 20 23 0 2 57 32 120 -33 33 10 26 33 30 22 32 51 8 33 49 44 62 0 0 33 6 22 0 2 59 33 121 -33 32 56 24 33 16 21 32 37 5 33 35 45 63 0 0 32 52 7 0 3 1 34 121 -32 32 42 8 33 2 6 32 22 48 33 21 32 64 0 0 32 37 38 0 3 3 35 122 -31 32 27 38 32 47 38 32 8 17 33 7 4 65 0 0 32 22 55 0 3 6 36 123 -30 32 12 55 32 32 56 31 53 33 32 52 23 66 0 0 32 7 59 0 3 8 37 124 -29 31 57 58 32 18 0 31 38 35 32 37 29 67 0 0 31 52 50 0 3 10 38 124 -28 31 42 49 32 2 52 31 23 24 32 22 22 68 0 0 31 37 27 0 3 13 38 125 -27 31 27 26 31 47 30 31 8 0 32 7 1 69 0 0 31 21 52 0 3 15 39 126 -26 31 11 50 31 31 55 30 52 23 31 51 27 70 0 0 31 6 4 0 3 18 40 127 -25 30 56 1 31 16 8 30 36 34 31 35 41 71 0 0 30 50 4 0 3 21 41 127 -25 30 40 1 31 0 8 30 20 32 31 19 43 72 0 0 30 33 52 0 3 23 42 128 -24 30 23 48 30 43 56 30 4 18 31 3 32 73 0 0 30 17 27 0 3 26 43 129 -23 30 7 23 30 27 33 29 47 52 30 47 9 74 0 0 30 0 51 0 3 29 44 130 -22 29 50 46 30 10 57 29 31 14 30 30 34 75 0 0 29 44 4 0 3 32 44 131 -21 29 33 58 29 54 10 29 14 25 30 13 48 76 0 0 29 27 5 0 3 35 45 131 -20 29 16 59 29 37 12 28 57 25 29 56 51 77 0 0 29 9 55 0 3 38 46 132 -19 28 59 49 29 20 3 28 40 14 29 39 43 78 0 0 28 52 35 0 3 41 47 133 -18 28 42 28 29 2 43 28 22 53 29 22 24 79 0 0 28 35 5 0 3 44 48 134 -17 28 24 57 28 45 13 28 5 21 29 4 55 80 0 0 28 17 24 0 3 47 49 135 -16 28 7 16 28 27 33 27 47 39 28 47 16 81 0 0 27 59 34 0 3 50 49 136 -15 27 49 26 28 9 43 27 29 48 28 29 27 82 0 0 27 41 35 0 3 54 50 137 -14 27 31 26 27 51 44 27 11 47 28 11 28 83 0 0 27 23 26 0 3 57 51 138 -13 27 13 17 27 33 36 26 53 38 27 53 21 84 0 0 27 5 9 0 4 0 52 139 -12 26 54 59 27 15 19 26 35 19 27 35 5 85 0 0 26 46 43 0 4 4 53 140 -11 26 36 33 26 56 54 26 16 53 27 16 40 86 0 0 26 28 10 0 4 7 54 141 -11 26 18 0 26 38 20 25 58 18 26 58 7 87 0 0 26 9 28 0 4 11 54 143 -10 25 59 18 26 19 39 25 39 36 26 39 27 88 0 0 25 50 40 0 4 14 55 144 -9 25 40 30 26 0 51 25 20 47 26 20 39 89 0 0 25 31 45 0 4 18 56 145 -8 25 21 34 25 41 56 25 1 51 26 1 45 90 0 0 25 12 43 0 4 22 57 146 -7 25 2 32 25 22 55 24 42 49 25 42 44 91 0 0 24 53 36 0 4 25 57 148 -6 24 43 24 25 3 48 24 23 41 25 23 37 92 0 0 24 34 22 0 4 29 58 149 -5 24 24 11 24 44 34 24 4 27 25 4 24 93 0 0 24 15 4 0 4 33 59 151 -4 24 4 52 24 25 16 23 45 8 24 45 6 94 0 0 23 55 41 0 4 37 60 152 -3 23 45 29 24 5 53 23 25 44 24 25 43 95 0 0 23 36 13 0 4 40 60 154 -2 23 26 1 23 46 26 23 6 17 24 6 16 96 0 0 23 16 42 0 4 44 61 155 -1 23 6 30 23 26 54 22 46 45 23 46 45 Uncertainty in time = +/- 2 secs [Prediction of 2008 Oct 31.0] Data for the target star ------------------------ * name: HIP 60081 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 19 13.4609 DE: -03 19 11.670 * position source: Pos: HIP2, pm: HIP2, pi:HIP2 * standard error: RA,DE ["]: ( .013, .008 ) * V mag [mag]: 8.0 * B mag [mag]: 8.7 * Apparent position with proper motion RA(deg): 184.9218789915 DE(deg): -3.3699950962 * Equation of equinoxes (radians) : 0.000051904401704 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1605) Milankovitch approx. diameter [km]: 33 approx. diameter ["]: .015 distance from Earth [AU]: 3.12900 * orbital information: orbit source: Preston date of fit: 2008 Aug 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 910 number of rejected observations: 61 time covered by the observations: 1936 Apr 13 - 2008 Apr 27 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.012, 102° remarks: * orbital elements for (1605) Milankovitch : Mean anomaly = 65.85925545 deg Arg. of pericenter = 278.93682354 deg Long. of node = 173.91052539 deg Inclination = 10.56925292 deg Eccentricity = 0.07894721 Semimajor axis = 3.01193774 AU Perihelion dist = 2.77415366 AU Mag: H = 10.17, G = 0.15 Epoch of elements : MJD 54807.00400000 TDT (2008 Dec 07.004) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 7 1605 Milankovitch 0h 6.0m UT 8.0 12 19 13.461- 3 19 11.67HIP 60081 8.7 15.9 33 1.2 3.129 2.681 -12.59 107.1687 -3.316 176.36 -22.62 0.0997 0.11107 0.35222 14.28368 -4.48000 -0.00515 0.00218 2000 64.53862520081130.00000278.936824173.910525 10.5692530.07894721 3.0119377 2.774153710.1 5.00.15 RATE 1.8855370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.014 99 1.97 0.015 0 54770.5020081207__60081 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 31, 00:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org